Combine kosher imitation crab, water chestnuts and scallions in a medium bowl. Season with salt and pepper to taste and stir until thoroughly mixed. Brush the edges of won ton wraps lightly with egg. Place about 1 teaspoon of mixture in the center of each wrap; pull the corners toward the center to make a point and press to seal. Repeat with remaining wrappers and filling. Preheat a large skillet over medium heat. Add peanut oil and dumplings and fry 2 minutes. Add broth, cover and reduce heat to low. Cook 2 minutes. Remove dumplings to a platter. In a small bowl, whisk tamari sauce and sesame oil together until combined. Serve dipping sauce with hot dumplings.